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Administrador de Django: modelo de sangría padre ForeignKey relación propia

Aquí está mi modelo:

 class Company(models.Model): class Meta: verbose_name_plural = "companies" name = models.CharField(max_length=30) parent = models.ForeignKey('self', blank=True, null=True, on_delete=models.SET_NULL) def __str__(self): return 'Company: %s' % self.name

¿Hay alguna manera de modificar el método def __str__ para mostrar los elementos secundarios con una sangría - o, según la relación con su elemento principal? Al igual que:

 Company A - Company C Company B - Company D - Company E -- Company F
over 4 years ago · Santiago Trujillo
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